Home / 11,105.13-15,325.56-6,389.40

Finding the Fourth Proportional to 11,105.13, 15,325.56 and 6,389.40

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Solution

The fourth proportional to 11,105.13, 15,325.56 and 6,389.40 is: 8,817.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,105.13 : 15,325.56 = 6,389.40 : x
  2. Step 2: Convert to fraction form
    11,105.13/15,325.56 = 6,389.40/x
  3. Step 3: Cross multiply
    11,105.13x = 15,325.56 × 6,389.40
  4. Step 4: Simplify right side
    11,105.13x = 97,921,133.06
  5. Step 5: Solve for x
    x = 97,921,133.06/11,105.13
  6. Step 6: Final answer
    x = 8,817.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.